/*****************************************************************************
 *
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2021 Artem Pavlenko
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *****************************************************************************/

#ifndef MAPNIK_TEXT_RENDERER_HPP
#define MAPNIK_TEXT_RENDERER_HPP

// mapnik
#include <mapnik/text/placement_finder.hpp>
#include <mapnik/image_compositing.hpp>
#include <mapnik/symbolizer_enumerations.hpp>
#include <mapnik/util/noncopyable.hpp>
#include <mapnik/pixel_position.hpp>
#include <mapnik/text/color_font_renderer.hpp>

#include <mapnik/warning.hpp>
MAPNIK_DISABLE_WARNING_PUSH
#include <mapnik/warning_ignore.hpp>

#include <mapnik/warning.hpp>
MAPNIK_DISABLE_WARNING_PUSH
#include <mapnik/warning_ignore_agg.hpp>
#include "agg_pixfmt_rgba.h"
#include <agg_trans_affine.h>
MAPNIK_DISABLE_WARNING_POP

// freetype2
extern "C" {
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_STROKER_H
}

MAPNIK_DISABLE_WARNING_POP

namespace mapnik {

struct glyph_t
{
    FT_Glyph image;
    detail::evaluated_format_properties const& properties;
    pixel_position pos;
    rotation rot;
    double size;
    box2d<double> bbox;
    glyph_t(FT_Glyph image_,
            detail::evaluated_format_properties const& properties_,
            pixel_position const& pos_,
            rotation const& rot_,
            double size_,
            box2d<double> const& bbox_)
        : image(image_)
        , properties(properties_)
        , pos(pos_)
        , rot(rot_)
        , size(size_)
        , bbox(bbox_)
    {}
};

class text_renderer : private util::noncopyable
{
  public:
    text_renderer(halo_rasterizer_e rasterizer,
                  composite_mode_e comp_op = src_over,
                  composite_mode_e halo_comp_op = src_over,
                  double scale_factor = 1.0,
                  stroker_ptr stroker = stroker_ptr());

    void set_comp_op(composite_mode_e comp_op) { comp_op_ = comp_op; }

    void set_halo_comp_op(composite_mode_e halo_comp_op) { halo_comp_op_ = halo_comp_op; }

    void set_halo_rasterizer(halo_rasterizer_e rasterizer) { rasterizer_ = rasterizer; }

    void set_scale_factor(double scale_factor) { scale_factor_ = scale_factor; }

    void set_stroker(stroker_ptr stroker) { stroker_ = stroker; }

    void set_transform(agg::trans_affine const& transform);
    void set_halo_transform(agg::trans_affine const& halo_transform);

  protected:
    using glyph_vector = std::vector<glyph_t>;
    void prepare_glyphs(glyph_positions const& positions);
    halo_rasterizer_e rasterizer_;
    composite_mode_e comp_op_;
    composite_mode_e halo_comp_op_;
    double scale_factor_;
    glyph_vector glyphs_;
    stroker_ptr stroker_;
    agg::trans_affine transform_;
    agg::trans_affine halo_transform_;
};

template<typename T>
class agg_text_renderer : public text_renderer
{
  public:
    using pixmap_type = T;
    agg_text_renderer(pixmap_type& pixmap,
                      halo_rasterizer_e rasterizer,
                      composite_mode_e comp_op = src_over,
                      composite_mode_e halo_comp_op = src_over,
                      double scale_factor = 1.0,
                      stroker_ptr stroker = stroker_ptr());
    void render(glyph_positions const& positions);

  private:
    pixmap_type& pixmap_;

    template<std::size_t PixelWidth>
    void render_halo(unsigned char* buffer,
                     unsigned width,
                     unsigned height,
                     unsigned rgba,
                     int x,
                     int y,
                     double halo_radius,
                     double opacity,
                     composite_mode_e comp_op);
};

template<typename T>
class grid_text_renderer : public text_renderer
{
  public:
    using pixmap_type = T;
    grid_text_renderer(pixmap_type& pixmap, composite_mode_e comp_op = src_over, double scale_factor = 1.0);
    void render(glyph_positions const& positions, value_integer feature_id);

  private:
    pixmap_type& pixmap_;

    template<std::size_t PixelWidth>
    void render_halo_id(unsigned char* buffer,
                        unsigned width,
                        unsigned height,
                        mapnik::value_integer feature_id,
                        int x,
                        int y,
                        int halo_radius);
};

} // namespace mapnik
#endif // RENDERER_HPP
